Plate 4. 



Fig. 1. 



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Caidopliacus schulzei. Unusual type of pinulus ; x 150. 



2. Regadrella delicata. Part of upper margin with adjoining lateral body wall. 



The slender parenchymal diacts of the body wall repre- 

 sented as less numerous than in nature ; x 14. 



3. Caulophacus schulzei. Prom a photograph. Upper body and stalk fastened 



together with pin ; \. 



4. Euplectella, sp. From a photograph. Lateral wall sliced away to show septa; {. 



Caidopliacus schulzei. Discohexaster ; x 250. 



Small type of discohexaster ; x 250. 



Pinulus from dermal surface ; x 150. 



Uncommon type of pinulus from gastral surface ; x 150. 



Pentact ; x 70. 



Pinulus from gastral surface ; x 150. 



11. Regadrella delicata. From a photograph. Dermal and gastral surfaces of lower 



part of body ; dermal surface to the left 5 gastral surface 

 to the right ; \. 



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